BlockWeight: StorageDescriptor<[], {
    mandatory: {
        proof_size: bigint;
        ref_time: bigint;
    };
    normal: {
        proof_size: bigint;
        ref_time: bigint;
    };
    operational: {
        proof_size: bigint;
        ref_time: bigint;
    };
}, false, never>

The current weight for the block.